考虑粒径分布的某大型排土场坡角设计

排土场具有成分复杂、粒径分布不均匀、孔隙率大、黏聚力小等特点，极易产生滑坡，为

此对大型排土场边坡坡面碎石土粒径分布进行现场调查。研究发现，大粒径碎石从坡顶到坡底的含

量逐渐提高，在坡底部含量占80.12%，粒径的分选性显著，决定了排土场力学性质下部强、上部弱的

分布特点。在此基础上通过对给定坡高所允许最大坡角进行研究，得出随着坡角增大边坡稳定系数

逐渐减小，两者之间近似呈线性关系，最终得到了180 m坡高允许的最大坡角为30°。研究为排土场

设计工作提供依据。

The dump has the characteristics of complex composition，uneven particle size distribu⁃

tion，large porosity and small cohesion，which is prone to landslide. Therefore，the particle size distribution

of gravel soil on the slope of large dump is investigated on site.The study finds that the content of large-size

gravel gradually increases from the top to the bottom of the slope，accounting for 80.12% at the bottom of the

slope，and the sorting of the particle size is significant，which determines the distribution characteristics of

the mechanical properties of the lower part of the dump and the upper part.On this basis，through the study

of the maximum slope angle allowed by the given slope height，it is concluded that the slope stability coeffi⁃

cient decreases gradually with the increase of slope angle，and there is an approximate linear relationship

between the two.Finally，the maximum allowable slope angle of 180 m slope height is 30°.The research pro⁃

vides a basis for the design of the dump.

1. Sinosteel Chifeng Jinxin Mining Co.，Ltd.;

2. School of Civil Engineering，North China University of Technology

摘要：

排土场具有成分复杂、粒径分布不均匀、孔隙率大、黏聚力小等特点，极易产生滑坡，为

此对大型排土场边坡坡面碎石土粒径分布进行现场调查。研究发现，大粒径碎石从坡顶到坡底的含

量逐渐提高，在坡底部含量占80.12%，粒径的分选性显著，决定了排土场力学性质下部强、上部弱的

分布特点。在此基础上通过对给定坡高所允许最大坡角进行研究，得出随着坡角增大边坡稳定系数

逐渐减小，两者之间近似呈线性关系，最终得到了180 m坡高允许的最大坡角为30°。研究为排土场

设计工作提供依据。

关键词:

排土场粒径分布边坡角塑性变形

Abstract: